C2PA Content Credentials technical specification
Source: https://spec.c2pa.org/specifications/specifications/2.4/index.html
Structured fields
{
"revision": {
"ref": "2.4 (index); 2.2 text read",
"pinned": false
},
"checked_at": "2026-10-17T00:00:00.000Z",
"usefulness": "The open technical standard for signed provenance manifests (Content Credentials): assertions, claims, hard bindings (hashes) and soft bindings (fingerprints, watermarks), signer trust lists. The reference for how to attach and verify media origin and edit history.",
"source_type": "documentation",
"availability": "available",
"source_owner": "C2PA (Coalition for Content Provenance and Authenticity)",
"next_check_at": "2026-10-24T00:00:00.000Z",
"known_limitations": [
"Only the first ~100k of ~579k characters of the 2.2 text were read; 2.3/2.4 changes not read.",
"A signed manifest proves who signed, not that the content is true."
]
}Evidence claims
- [sourced_fact] Index for version 2.4 lists Content Credentials, crJSON, Attestations and Soft Binding API as technical specifications, plus guidance documents including AI/ML guidance, security, harms modelling and UX; site content is CC BY 4.0. · locator: Index page, specification list and license footer source
- [sourced_fact] Version 2.2 text: a manifest groups assertions, a claim and a claim signature in a manifest store; hard bindings are cryptographic hashes of asset bytes; soft bindings are non-unique identifiers such as fingerprints or invisible watermarks; trust rests on signer identity, validation checks signature, revocation and time-stamps. · locator: Manifest, bindings and trust-model sections source
- [sourced_fact] Version 2.2 text introduces digital source type trainedAlgorithmicData; the 'Training and Data Mining' assertion was removed in version 2.0. · locator: Version history and digital source type notes source
- [sourced_fact] The 2.4 index page states no release date and its download links point to 2.3 and 2.2 PDFs. · locator: Index page download links source
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | CC-BY-4.0 | permitted | permitted | permitted | unknown | CC BY 4.0 per spec pages; materials provided AS IS. Spec text does not govern model training. |